機器
aluminum
background
bending
business
caucasian
construction
container
curved
engineering
extrusion
fabricating
fabrication
factory
folding
grey
heavy
industrial
industry
iron
ironworks
making
man
manufacture
manufacturing
men
metal
metallic
metalwork
nickel
person
plant
preparation
profiles
roll
shaped
sheet
silver
stack
steel
stock
store
texture
tube
tubing
warehouse
work
worker
workshop
zinc